来源:BMC Pregnancy and Childbirth
作者:Edeltraut Garbe;Ingo Langner;Christina Lindemann;等
关键词:Time trends;Absolute and relative indications;...
来源:BMC Pregnancy and Childbirth
作者:Edeltraut Garbe;Ingo Langner;Christina Lindemann;等
关键词:Time trends;Absolute and relative indications;...
来源:BMC Pregnancy and Childbirth , 2021
作者:Chengxiao Yu;Ci Song;Zhibin Hu;等
关键词:Maternal mortality ratio;Trends;...
使用许可:CC BY